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7468ccfadf
commit d1bb19b8f751875472211312c8e810143a7ba4b6
Author: Manuel Ung <mung@fb.com>
Date: Fri Feb 3 11:50:34 2017 -0800
Add cardinality stats to information schema
Summary: This adds cardinality stats to the INFORMATION_SCHEMA.ROCKSDB_INDEX_FILE_MAP table. This is the only missing user collected properties from SST files that we don't expose, which is useful for debugging cardinality bugs.
Reviewed By: hermanlee
Differential Revision: D4509156
fbshipit-source-id: 2d3918a
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/*
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Copyright (c) 2012,2015 Monty Program Ab
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#pragma once
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/* C++ system header files */
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#include <string>
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/* MySQL includes */
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#include "./m_ctype.h"
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/* RocksDB header files */
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#include "rocksdb/comparator.h"
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/* MyRocks header files */
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#include "./rdb_utils.h"
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namespace myrocks {
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/*
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The keys are in form: {index_number} {mem-comparable-key}
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(todo: knowledge about this format is shared between this class and
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Rdb_key_def)
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*/
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class Rdb_pk_comparator : public rocksdb::Comparator {
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public:
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Rdb_pk_comparator(const Rdb_pk_comparator &) = delete;
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Rdb_pk_comparator &operator=(const Rdb_pk_comparator &) = delete;
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Rdb_pk_comparator() = default;
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static int bytewise_compare(const rocksdb::Slice &a,
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const rocksdb::Slice &b) {
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const size_t a_size = a.size();
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const size_t b_size = b.size();
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const size_t len = (a_size < b_size) ? a_size : b_size;
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int res;
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if ((res = memcmp(a.data(), b.data(), len)))
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return res;
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/* Ok, res== 0 */
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if (a_size != b_size) {
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return a_size < b_size ? -1 : 1;
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}
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return HA_EXIT_SUCCESS;
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}
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/* Override virtual methods of interest */
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int Compare(const rocksdb::Slice &a, const rocksdb::Slice &b) const override {
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return bytewise_compare(a, b);
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}
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const char *Name() const override { return "RocksDB_SE_v3.10"; }
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// TODO: advanced funcs:
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// - FindShortestSeparator
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// - FindShortSuccessor
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// for now, do-nothing implementations:
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void FindShortestSeparator(std::string *start,
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const rocksdb::Slice &limit) const override {}
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void FindShortSuccessor(std::string *key) const override {}
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};
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class Rdb_rev_comparator : public rocksdb::Comparator {
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public:
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Rdb_rev_comparator(const Rdb_rev_comparator &) = delete;
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Rdb_rev_comparator &operator=(const Rdb_rev_comparator &) = delete;
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Rdb_rev_comparator() = default;
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static int bytewise_compare(const rocksdb::Slice &a,
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const rocksdb::Slice &b) {
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return -Rdb_pk_comparator::bytewise_compare(a, b);
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}
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int Compare(const rocksdb::Slice &a, const rocksdb::Slice &b) const override {
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return -Rdb_pk_comparator::bytewise_compare(a, b);
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}
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const char *Name() const override { return "rev:RocksDB_SE_v3.10"; }
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void FindShortestSeparator(std::string *start,
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const rocksdb::Slice &limit) const override {}
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void FindShortSuccessor(std::string *key) const override {}
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};
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} // namespace myrocks
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